Good evening! For a fast launch, I would choose a lease with a clear LOA and announcement process instead of starting a full ownership transfer. InterLIR Global https://interlir.global/ operates an IPv4 marketplace and can deliver leased space quickly while handling documentation and RIR-related support. You should send your ASN, target region, use case, and desired activation date immediately. Before paying, confirm the exact prefix, reputation status, permitted traffic, renewal terms, and abuse procedure. Ask for a written timeline and make sure your upstream provider can announce the block as soon as the LOA is issued.